<p>As a geophysicist, I was really concerned about winding up in Houston after finishing a PhD, and it’s one of the main reasons that I did not continue with further graduate studies (got an MS instead because it’s a more flexible degree). Furthermore, she should consider that a PhD is typically considered a career limiting move in the corporate world. If your GF wants to go into industry, she had really better want to do research, because it’s not easy to transition back to the main geoscientist track with a PhD in Geophysics. In some cases, her career may be substantially limited or constrained: financially, geographically, and in opportunity for advancement by a PhD. In other cases, it might be advantageous to have a PhD (e.g. if she wants to do research). No one really can say for sure whether it will pay off or not in advance. </p>
<p>However, if she wants to really use her PhD, then she either has to go to industry (Houston), or hope to find a position in academia or a government lab. There are positions in academia and government labs (and limited industrial positions) on the coasts. Positions in academia are fiercely competitive (it’s basically akin to winning the lottery if you land one), and positions in government labs are typically not attractive (Sandia) or not available (USGS, Berkeley, etc.). She might not want to work on the coasts either, because those jobs typically pay MUCH less than those in Houston (maybe 30-50% less than a well-paid petroleum geophysicist). </p>
<p>Outside of those options: if she wants to work in Denver, Calgary, Australia, or any of the more interesting geographic locations, then she probably will never see a significant benefit to getting a PhD as most of the companies in those locations are small, niche players that have limited resources, and do not have significant R&D groups. Some of the larger mining companies (Newmont) are notable exceptions, but they are notoriously difficult to get into, and their geophysics group is tiny: maybe two dozen individuals for the entire company. The few companies in those areas that do hire geophysicists with advanced degrees are typically more software or imaging oriented (in the petroleum industry). If she wants to get in with those companies, than she should heavily emphasize the computer science aspect of her education, and take internships during her graduate career. Outside the petroleum industry, the environmental and engineering industries do hire PhDs in better geographic locations, but the pay is terrible ($50k for an environmental geophysicist vs >$100,000k for petroleum). Additionally E&E jobs require significant field work and it’s not clear how secure those jobs are in a time of government cutbacks. </p>
<p>This is not to say though that she would not be able to find a decent job in a good location that’s amenable to both of you. I know that some people have managed to pull it off, but the reality is that they are an exception, and not the rule.</p>